Internal stem operated tractor gate



Sept. 27, 1938. P. A. KlNZlE ET AL 2,131,051

I INTERNAL STEM OPERATED TRACTOR GATE Filed Dec. 28, 1935 7 Sheets-Sheet 1 Fig.1 F .3 2 7 2 39 23 243 24 3 Phillip A. Kinzie BY Bernard A. Hal/idqy f Warren H. Koh/er ATTORNEY.

Sept. 27, 1938. P. A. KlNZlE ET AL INTERNAL STEM OPERATED TRACTOR GATE Filed Dec: 28, 1935 7 Sheets-Sheet 2 s ATTORNEY.

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EZ L O W. a a w AAM Pm ml a r 3 e Sept. 27, 1938. P. A. KlNZiE ET AL INTERNAL STEM OPERATED TRACTOR GATE 7 Sheets-Sheet 4 7 Filed Dec. 28, 1935 Fig INVENTORS. Kz'rzzie Phillip A Bernard A. Halliday 2 Warren H. Kohl er ATTORNEY.

Sept. 27, 1938. RA. KINZIE El AL INTERNAL STEM OPERATED TRACTOR GATE Filed Deci 28, 1935 7 Sheets-Sheet 5 ii i 22% A K 211216 day 5 Mzrrmh Aa/1/er ATTORNEY PA m n. m e B B Sept. 27, 1938. P. A..K|NZIE El AL INTERNAL STEM OPERATED TRACTOR GATE Filed Dec. 28, 1935 7 Shee ts-Sheet e AAAA A m H e m r m E e O W mm n Kao A H A .w dn? ,h a WW B P 1938. P. A. KINZIE El AL 2,131,051

INTERNAL STEM OPERATED TRACTOR GATE Filed DEC 28, 1935 7 Sheets-Sheet 7 29 I Fig.21

" T INVENTORS.

Phz'ilz' A. Kz'nzz'e 167 177 Ber'narf A. Halfz'day g2 Warren H. K011 Ier ATTORNEY.

Patented Sept. 27, 1938 UNITED STATES PATENT OFFICE INTERNAL STEM OPERATED TRACTOR GATE Phillip A. Kinzie, Bernard A. Halliday, and Warren H. Kohler, Denver, 0010., assignors to Universal Hydraulic Corporation, Denver, 0010., a corporation of Colorado Application December 28, 1935, Serial No. 56,418

5 Claims.

gates wherein closure is efiected by means of a roller-mounted leaf or closure element, contained within a housing and operated by twin hoisting means, mounted integral with the housing members. More particularly, our invention relates to improvements on gates employing the principle of operation disclosed in the application filed by Phillip A. Kinzie February 8, 1933, Serial No. 655,803.

The trend in modern hydraulic practice is toward the employment of larger conduits and penstocks; and since all such conduits and'penstocks must be provided with gates, valves, or some such closure device, the type of such closure devices which will yield a maximum eificiency and yet will be compact and simple in design becomes an absolute necessity. In the type which is our invention, the fluidway through the gate is made to conform to the shape of the fiuidway of the connected conduit or penstock, a feature which insures a maximum efliciency for fluid flow.

-In order to minimize'the overall height of these gates it is essential that the hoisting stem elements be contained within the area defined by the gate and the hoist housings. This is important so that the overhead clearance requirements for the gate will not necessitate excessive building heights or clearance requirements for traveling or gantry cranes. ,Too, by confining the hoist stems within the gate housing, the stems are protected against being struck and damaged while in the raised position. In addition, the arrangement of the internal stem elements is such that they form an oil reservoir in which the stems are immersed. In short, the invention provides a compact and efiicient gate for the interruption of fluid flow through a conduit, penstock, or orifice.

Our invention also has as an object, the arrangement of a gate unit wherein all the elements comprising the structure will be confined within the area defined by the housing and integral hoist case members. I

A further feature is a hoisting means whereby dual stem elements -are employed to raise and lower the leaf or closure memberj and wherein said stem elements and leaf member are contained within the area defined by the housing and hoisting members.

Additionally the invention has as an object,

the arrangement of the hoisting stem units with- I in the gate whereby the stem elements telescope within one another during the raising or lowering of the gate leaf.

Still another feature of our invention is a" the rollers travel around a continuous oval-v shaped track and wherein the central wedge rollers are positively and adjustably positioned by means of chains attached to the upper and lower termination thereof.

A spring loadedpacking gland which automatically compensates for wear ofthe packing isanother object of the invention.

Also our invention has as an object a twin toggle mechanism which will maintain the leaf and roller trains in the proper relationship at all. times; yet will not impose lateral thrusts upon the leaf or stem elements.

The means whereby large size valves may be sectionalized to facilitate manufacture andtransportation thereof is another feature of our.

invention; and a gate, compact in design, efficient in hydraulics and neat in' appearance is also an object of our invention.

With the foregoing features and objects in view, there will now be described, for the purpose of satisfying the patent statutes, specific embodiments of the invention which have been illustrated in the accompanying drawings forming a part hereof, and wherein:

Fig. l is a side elevation of a complete valve unit.

Fig. 2 is a half elevation and a half sectional; view looking upstream along the axial center-line of flow, and is taken on the plane 2-2 of Fig. 1. Fig. 3 is a sectional view taken on the plane 3-3 of Fig. 2. 7 I

Fig. 4 is a sectional view looking downstream along the axial center-line of flow, and is taken on the plane 44 of Fig. 1.

Fig. 5 is a sectional view taken on the plane 5-5 of Fig. 4.

Fig. 6 is a sectional view taken on the plane 6-6 of Fig. 4.

Fig. 7 is an enlarged sectional view of a portion of Fig. 5.

Fig. 8 is an enlarged sectional view of a portion of Fig. 7. J

Fig. 9 is a sectional view taken on the plane 9-9 of Fig. 4.

Fig. 10 is a sectional view along a plane identical to that of Fig. 9, but with the gate leaf '-in:-A

the extreme lowered position.

Fig. 11 is a sectional view taken on the' plane II-II of Fig. 10.

Fig. 12 is a sectional viewtaken on the plane I2-I2 of Fig. 10.

Fig. 13 is a side view of a typical roller and linkage assembly.

Fig. 14 is a sectional view taken on the plane I4I4 of Fig. 13.

Fig. 15 is a sectional view taken on the plane [9-49 of Fig. 18.

Fig. is an enlarged portion of Fig. 19 showing the arrangement of the packing gland.

Fig. 21 is a partial sectional view of a second alternative type of stem construction.

Fig. 22 is a sectional view taken on the plane 22- 22 of Fig. 21.

Fig. 23 is a sectional 'view taken on the plane 23-23 of Fig. 21.

Fig. 24 is a sectional view showing the connections from the oil cylinder to the stems.

In the accompanying drawings Figs. 1 to 17 inclusive illustrate a complete valve; Figs. 18 to 20 illustrate one arrangement of the stem assembly; and Figs. 21 to 24 inclusive illustrate another arrangement of the stemassembly. In all is encased by the upper upstream frames 2,

stream bonnets II and I2, uppel'i of the figures identical parts are designated by thesame reference numerals.

By reference to the accompanying drawings, Figs. 1., 2 and 3, it will be seen that the leaf I upper downstream frames 3, lower upstream frames 4, lower downstream frames 5, lower upstream bonnets 6 and I, lower downstream bonnets Si -and 9, bottom bonnet cover I3, upper upbonnets I3 and H, the hoist cases I5 and I6, and the upper bonnet cover I7. With the leaf I in the raised position (Figs. 2 and 3) the circular fluidway 18 through the leaf coincides with the "circularfluidway I9 through the frame members 2, 3, 4, and 5; thus when-the leaf is raised and the gate is wide open. the fiuidway through the gate conforms in shape with the connected fluid carrying members 20 and 2i. This construction allows the gate tobe madeveryshort inasmuch as costly and inefficient transition sections of the fiuidway are unnecessary. When closure of the fluidway is desired, the leaf I is lowered and. the

bi ilkhezui portion 22 of the leaf closes. the fluid- "way I9 and stopsfurther passage of fluid there through. V 7 r The leaf I is raised or lowered by a twin hoist unit mounted upon the upper flanges of the upper .upstream and downstream bonnets I2 and I4 (Figs. 4 and 15). The motor 23 has the speed reduction units 24 attached to both ends and forming an integral part thereof. The drive shafts 25 which extend outward from the reduction units terminate and are securely keyed in the flexible couplings 26. The pinion shafts 21, which are in keyed engagement with the flexible couplings, are received within the bores of the bevel pinions 28 and are securely keyed therein. Each bushing g29 receives the extended hub of a pinion 28 and is locked against rotation by the set screw 30. .Q'Ihe stuffing box 3| with the packing 32 and the gland 33 renders the gear case oil tight at this I point. A bevel gear 34 is in mesh with each bevel pinion 28 and is bolted to the centralizing or hub member 35 which has an upwardly extending hub 1 portion 36 and downwardly extending hub portions 31. The hub portions 36 are centralized gearcase covers 39. The hubs 31 are centralized withinbores in the hoist cases I 5 and I6 and each has at its upper termination a flanged portion 40 which. rests upon the anti-friction roller thrust bearing'dl. Oil tightness is insured around the downwardly extending hubs 31 by means of the packings 42 and the glands 43 so that the hoist cases may be filled with oil through the removable covers 44 to the level desired'and indicated on the level gauges 45. The threaded portions 53 on the stems 4? are matingly received within the downwardly extending hubs 31, and transfer the vertical load imposed by the leaf I to the hubs 31 whence it is transmitted to the thrust bearings ll. ThQ'kGYS 48 at the upper termination of the stems M prevent their rotation Within the central bores in the huomembers 35, thus rotation of the bevel gears 34 causes rotation of the hub members and stems.

'Ageared indication and control unit 49 registers the position of the leaf I and automatically stops the motor 23 when the gate leaf I is in either the wide open or in the fully closed position. The cover 50 encases and protects this nit- The downwardly extending threaded portions 5| of the stems 41 (Figs. 15 and 1'7) are matingly received by the nuts 52 which are threaded and welded to the inner extension tubes 53. The lower fend of each inner extension tube 53 is threaded and welded to the connection nut 54 which. also has threaded and welded thereto the outer extension tube 55. The outer extension tube 55 terminates at the upper end in the flange 56 which is secured to one of the crosshead trunnions 51 (Figs. 4, 11 and 15) by the studs 58. The bafile tube 59 is interposed between the inner and outer extension tubes and is connected to the hoist case by bolts 60 through the flange portion 61. Since the space 62 between the tubes 53, 55, and 59 is filled with the fluid passing through the gate,'to prevent the escape of this fluid' the packing 63, which is retained by the gland 64 andthe studs 65, is provided between the lifting nut and bafile tube. In addition to this packing the dual piston rings 66 serve to prevent leakage, and permit the packing 63 to be replaced while the valve is in service in the full open (raised) position. These piston rings 66 also act as scrapers on the interior of the baffle tube 59 and remove any scale or corrosive deposits which might collect thereon, and thereby prolong the life of tliepacking 63.

The space 61 within the inner extension tube 53 is filled with a lubricating oil through the pipe '68 which is threaded into the lifting nut 52. .A mating drilled hole 69 communicates with the groove I in the lifting nut and provides the means for filling the interior space Elwith oil. Several such filling holes are provided in order that air may escape from the interior space 61 while oil is being inserted therein. Thus it will be seen that when theleaf is raised the stems are immersed in a bath of oil; 7

The cylindrical baflie II which is attached to the lifting nut 52 prevents any small leakage which might occur, when the leaf and stem assembly are in the lowered position (Fig. 11) from entering the interior space '5'! past the stem thread by providing a reservoir in which such leakage is confined. Since the leakage past the packing 63 and piston rings 66 will be small, this additional area will be sufficient to accommodate this leakage; and when the leaf I is raised and the stems and baflie tube while the gate leaf and I stem units are in the lowered position. It will be noted that the gland 0 is accessible from the exterior of the gate structure through the opena ing M in the hoist cases I5 and I5. This fact carriages.

permits tightening the packing gland 69 with the gate leaf in the raised or open position.

The holes I5 at the bottom of the outer extension tube 55 are provided in order that the water 1 will have to flow therethrough during the oper ating cycles of the gate andthus wash away any sediment or scale which may collect at this point. Too, these holes automatically drain the space between the inner and outer extension tubes when the conduit or penstock is emptied and thus prevent the hazard of retaining water within this space.

The crosshead trunnions 51 (Figs. 4, 11, and 15), which are attached to the crosshead beam I6 by the bolts 17, are provided with the lugs I8 which are bored to receive the pins I9. The links are attached to the crosshead trunnionsby the pins 19, and are connected to the lower links 0| by the pins 82. The pins 83 secure the lower links 0I to the sliding shoe 85. The extending tongues on the shoe 89 are slidably received within a mating groove in the anchorage plates 05 which are secured to the leaf I by the studs 81. The rollers 88, which are interposed between the upper and lower links on the pins 82, perform a function which will later be described herein.

The trunnion elements 89 (Fig. 1-1) on the crosshead trunnions 51 enter matingbores inthe upper carriage heads 90, and are clamped therein by means of the disks 9! and the bolts 92. "The bolts 93 (Figs. 9 and 10) secure the wedges 94 and the idler tracks 95 to the respective upper carriage heads 99, and similar bolts 95secure the lower carriage heads 91 to 94 and 95. This arrangement forms oval-shaped tracks 'around which the roller chains, composed-of the rollers 98 and the links 99, travel while the gate is being raised or lowered. Each oval-shaped carriage is faced with non-corrodible tracks I09 on the carriage heads and 91, IOI on the wedge 94, and I02 onthe idler track 95. These non-corrodible tracks insure a permanently smooth surface upon which the roller trains travel. Guide strips I03 (Fig. 7) retain the roller trains on the oval-shaped with guide strips I05 are attached to the frame Non-corrodible parallelv tracks I04- and bonnet membe'rs'and it is along these tracks that the roller carriages travel when the gateis being raised or lowered. 1

The sloping surface I06 on the interior of each wedge 94 is faced with a non-corrodible track I01. and is provided with guide strips I08 (Figs. '7, .9, and '10). A mating sloping surface I09 which is an integral part of the gate leaf I too has 'non corrodible tracks I I0 and guide strips. A string of rollers 98 is contained in the sloping groove thus formed between the gate leaf and the wedge, and thus affords a means for securing practically frictionless movement between each roller carriage and the leaf, a condition which is. a;

essential for efficient operation of the gate. The chains-III and H2 (Fig. 10) are rigidly attached to the wedge by the clevis blocks H3 and bolts I I I and are looped around the pinions I I5 at the upper and lower termination of the central roller train. The lower chain III has the other vend rigidly secured to the leaf, by the clevisblock I I3 and the bolts H4, but the upper chain II2 isattached to the clevis member IIB which is adjustable by, the studs Ill. These studs II! are securely retained by the sole plate II8 whichis rigidly fastened to the gate leaf I. This arrangement permits each central roller train to headjustedqto th'eproper position, and at the same time definitely retains the trains in the adjusted position. Y I i The links 99 are retained in an identical manner on the. rollers 93 for both the wedge roller trains and the roller trains around the roller car riages (Figs. 13 and 14) The extending hubs II9 on the rollers 98 are each grooved to receivea splitcollar !20 which has slots at 90 from the slipped on the extending hubs I I 9, a lock washer I2I isplaced on each extending hub, and a split collar I20 is inserted in the groove therein after which theears I22 on the lock washers I2I are bentoutward until they enter the slots in the split collars I20 and thus lock the links 99 on the rollers 98. I

' It is essential that the rollers 98 bear firmly on their respective rolling surfaces at all times while the gate is being moved. To accomplish this effect spring loaded slidebars I23 (Figs. 4, 7, and 8) are inserted in grooves on the upstream face of the gate leaf I and bear against mating stationary bars I24 fastened to the frame and bonnet members. The springs I25 which are inserted'into counterbores I26 in the leaf I push each slide bar I23 against the'mating bar'l24 and produce a reaction which results in the leaf being held tightly against the rollers 98 and non-corrodibl'e tracks, IOIandI04,alsoI0'I and H0. The bolts I21. retainthe slide bars on the leaf. The counterbores I26 are each lined with non-corrodible metal, the disk I28 on the bottom and the cylinder I29 on the sides. The disk I30, which is entered in the bore in each cylinder I29 and. upon which the spring I25 bears, provides a means of transmitting frictional resistance, resulting from the sliding of I23 along I24, to the leaf by shear. Inaddition to holding the leaf tightly upon the rollers these spring loaded slide bars I23 exert a dampening effect upon the tendency of the leaf to vibrate during closure under unbalanced conditions. A further dampening effect is exerted by introducing air on the .downstream face ofthe leaf through the manifold I3I, (Figs. 1, 2 and-3); This tendency to vibrate is caused by a partial: vacuum which is produced by therapid fluid fiow beneath the partially closed leaf.

toggles tend to expand, but are restrained from order to insure that the proper relationship is maintained between the crosshead and gate leaf during the operating cycle. With the leaf in the closed or partially closed position there is a tendency for the leaf to roll upward along the wedge surfaces of the roller carriages because greater water pressure is present on the upstream face of the leaf than is present on the downstream face of the leaf. This is the case during closure with a fluid passing through the valve. Unbalanced pressure between the upstream and downstream faces of the leaf produces a force perpendicular to the wedge surface which when broken up. into horizontal and vertical components, produces a force tending to move the gate downstream and a force tending to roll the gate upward. At first glancejthe weight of the leaf would seem to be sufficient to nullify this upward component; however. careful calculations show in many instances that even with slopes of less than one-quarter inch per foot, this component attains a magnitude in excess of the weight of the gate leaf. It is, therefore, necessary to provide a means ofnullifying this upward component; the toggles perform this function. If the leaf tends to roll up the wedge planes the so" doing until the leaf comes to rest on the bars I33 by the tracks I32 on the upper bonnets. When the leaf has come to rest on the bars I33 and the rest beams I34 (Figs. 2 and 12) the rollem 88 will have begun to roll outward along the faces of the cams I35 (Fig. 16) which prevent the leaf from moving upward during the process of seating of the leaf. When the toggles. are fully expanded (Fig. 16) the wedges will be completely lowered; and because of the slope of the wedge plane, the leaf will move downstream and the seat ring I36 (Figs. 2 and '7) on the bulkhead portion 22 of the leaf I will come to seat against the seat ring I31 on the frames 3 and 5 (Fig. 6).

- In order to insure proper alignment of the seat when the ate leaf comes to rest on the bars I33.

It will be noted that on the drawings shown herein the leaf and housing members are shown as being made in sections. This is done to show the feasibility of manufacturing large gates of this type' using reasonable and transportable component members; however, in smaller size valves the members can be made of fewer parts, since the size of the sections is determined by manufacturing and transportion facilities.

Figs. 18, 19, and 20 show one alternate stem arrangement; and Figs. 21, 22, 23, and 24 show a second alternate. These alternates are similar in that they both employ floating pistons to maintain oil pressure within the stem 'encasing members at a pressure equivalent to external fluid pressure surrounding the immersed parts, and in that both arrangements employ self-adjusting stuffing boxes. Therefore, in describing these parts, reference will not be restricted to either alternate.

1 The first alternate has dual stems I M which are secured to the hoisting mechanism and rotatewith the bevel gears 34. The threads I42 on the downwardly extending portion of each of I the stems I4I are received within the nut I43 (Fig. 19) which is Welded within a counterbore in the inner tube I44. The lower termination of the inner tube I44 is threaded and welded to the plug I45 which has also threaded and welded thereto the outer tube I46. The upper portion of the outer tube terminates in a flange I41 which is attached to the crosshead trunnion I48 by the bolts I49. The sheath tube I50 is interposed between the inner tube I44 and the outer tube I46, and is welded into the cup member I5I which is secured to the underside of the hoist case I5 by the bolts I52. The packing I53 which is retained by the gland I54 and the studs I55, prevents the escape of water or fluid from the interior of the gate housing. In order to 'exclude water or fluid from the area inside the outer tube I46 and retain the oil therein, the crosshead trunnion I48 is counterbored (Figs. 19 and 20) to receive the packings I56 and I51 which are held firmly in place by means of the compression springs I58. These springs I58 press downward against the ring I59 while the upward reaction is taken by the gland insert I60 which is secured to the cross head trunnion by the screws I6I. head bolts I62, which are threaded into "the ring I59 and which are received within counterbores in the gland insert I60, retain the springs I56 and ring I59 in assembly with the gland insert I60, should the unit be removed. It will be noticed that the springsfI58 are given a considerable initial compression so that as the packings I56 and I5! wear the springs will expand automatically and compensate for the wear and thus maintain the stufling box fluid tight. packings I56 and I5! because of the V type construction alsoaid in securingfiuid tightness of the stuffing box, by their inherent characteristics and by the relation in which they are placed in the counterbore in the crosshead. The lower packing I56 has the Vs inverted and the upper packing I 51 has the Vs in an upright position; thus when oil percolates upward from the interior cavities around the stem and enters the spaces between the inverted Vs, the pressure causes the Vs to tend toflatten out and as a result the packing bears more tightly against the walls of the counterbore in the crosshead trunnion and against the exterior surface of the sheath tube I50. The upper packing I51 functions in an identical manner to exclude water from the interior cavities around the stem I 4 I. Thus by means of a spring.- loaded packing gland, and by a method of assembling the packings which utilizes to the best advantage the inherent characteristics of said packings, we secure a stufiing box which is effective against internal and external pressures and which will automatically compensate for wear of v the packing elements.

Oil is introduced into the interior spaces I 63 around the stems I 4| through the holes I64 by the pipes I65 which are in communication with the cylindrical oil chamber A (Fig. 18). ber A is filled with oil through the hole I66, and after the stem spaces I63 as well as chamber A have been completely filled with oil through the hole I66 and the floating piston I61 occupies the position shown on Fig. 18, the hole I66 is plugged and the oil system is then ready for operation.

The fillister Cham-' In order to build up a pressure in the oil reservoir system which will be equal to the internal pressure of the water passing through the valve,'wat"er is admitted to the chamber B through the screen unit I16. Thus the water pressure 'in'chamber B causes the floating piston I61 to impress upon the oil in chamber A and its communicating pipes and spaces, a pressure equal to that of the water passing through and contained within thegate housing members. The floating piston I61 (Figs. 18 and 21) is of a unique design. Two pressure heads IBB are held together by the stud I69 and the nuts I16. The key I1! prevents these heads from rotating with respect to each other. The heads'l68 are grooved to receive the piston rings I12, and have the inwardly extending skirts turned down to a smaller diameter which receives the packings I13.

The packing glands I14 have a series of mating cups in their inwardly extending flange portions into which the compression springs I15 are inserted. Since the compression springs I15 are interposed between the packing glands, the force therefrom is impressed upon both packings I13 and maintains them fluid tight. also automatically compensate for wear on the packings I13 by moving the glands outward as wear of the packings occurs. In order to provide a permanently smooth cylinder for the floating piston I31 to slide upon, the cylinder is provided with the non-corrodible liner Ill.

During an operating cycle of the gate the "floating piston I61 functions in a manner which will now be described. Assuming the gate leaf to be in the raised position with the stem elements in the relation shown of Figs 18 and 19,

proper rotation of the stems I 4| will cause the leaf l to be lowered because it is connected through the toggles and crosshead trunnions I48 to the outer tubes I46 which in turn are integrally connected to the inner tubes I44 and lifting nuts I43. Since the stems MI and the sheath tubes I50 do not travel downward during this operation, it is apparent that the downward travel of the inner and outer tubes I44 and I46 respectively will increase the cubical contents of spaces I63 within the encasing tubes; therefore it becomes necessary to supply additional oil to the interior stem spaces I63 in order that they may be maintained completely full of oil. The

floating piston I61 not only maintains the interior spaces I63 full of oil but also maintains the oil within these areas at a pressure equal to the exterior water pressure. The oil which enters the areas within the outer tubes I46 is fed therein by the pipes I65 which are in communication with chamber A, which is the oil chamber. Because of the fact that water of a pressure equal to the pressure prevalent in the fluidway and leaf encasing members is admitted to chamber B, the water will impress upon the Water side of the floating piston I61, a pressure which will be transmitted to the oil in chamber A; and since the relative area of both chambers A and B is equal, the pressures will be equal. Since fluid pressure is transmitted undiminished to all parts of a connected system, it is apparent that the oil pressure within the stem units will be equal to the pressure of the exterior Water in which they are immersed. As the interior spaces I63 withdraw oil from chamber A, the floating piston will move to the right due to the force exerted thereon by water pressure in chamber B. During the time while the gate is being raised the reverse operation will take place.

The springs- I 15;

5 Asthe hoist rotates the stems m in raising the gate; their action on the oil within the interior spaces is analogous to that .of a hydraulic jack.

As-the stems are turned the inner and outer tubes as well as the leaf and associated parts are raised, and at thesame time the oil Within the spacesI63 is displaced and is forced back into chamb'er'A through the pipes I65. This action causes the floating piston I61 to move tothe left against thewater pressure in chamber B. Thewater inchamber B consequently is forced outthrough the screen unit I16, an action which flushes out any sediment ,or particles which, may have collected on the screen during the inflow of Water. to chamber B and preventsfclogging the screen unitwith, foreign matter andQtrash which" maybe present inthe water. ,When the leaf-is completely raised the floating piston will occupya position to the left of the centerline of the gate "(approximately as shown on Fig.'18) It istobe understoodthat the phrases and words usedhe'reinwhich refer to the movement of the. floating piston as being to thefrightfor left.

are'usedonly to clarify this particular applica tion. We do not wish it to be construedflthat effectiveness of the principle involvedfherein is reequivalent to the exteriorwater pressure, can.

readily be applied tomany other devices'lwhich' require internallubrication while submergedlbe neath a fluid; for example, a submerged bearing.

Specific designs and applications of thisjprincipie to other mediums" will be made at a future The secondalternate' stem arrangemenhjshown V on Fig's. 26.1 170 24 ,"is1 a. somewhat modified'arr 14 rangement of the firstalternate. In this arrangement (Fig. 21) a lifting tube I18 is threaded into the ,bevel gear hub I19 and locked against rotationfthereinby the keys I86." A liftinginut I.8I,

isreceived and welded within a; counterbore at the lower end of the tube I18, and engages the threads on the stem I 82. The stem I82 is threaded and Welded into the cap I93 which is also connected to the outer extension tube I94. The outer tube I84 terminates in the flange I85 which is attached to the crosshead trunnion I86 by the bolts I81. A spring-loaded stuffing box identical in construction with the one which has already been described is inserted between the counterbore in the crosshead and the outer tube I84 and thus renders the space I88 within the outer tube fluid tight. Upward escape of water past the tube I18 to the outside of the hoist case is prevented by the packing I89 and the gland I90. A similar upwardly facing gland I9I and packings I92 and I93 prevent the escape of oil from the hoist case reservoir and at the same time prevent escape of oil from the interior stem spaces I86. The ring I94, which is interposed between the packings I92 and I93, is I shaped in cross-section and thus forms the outer annular passage I95 (Fig. 23) and the inner annular pasj sage I96. The holes I91 provide communication tion between the inner annular passage I86 and the interior space I88 within the tube I I8. Oil from chamber A is delivered to the outer annular passage I95 by the pipes I99 whence it is delivered to the space I88 through annular passages and the respective communicating holes. The cap 200 (Fig. 21) is welded in the top of the tube I18 to prevent the upward escape of oil into the hoist case.

The floating piston I81 functions in exactly the same manner as has already been described for the previous alternate, and thus maintains the interior space I88 completely full of oil at a pressure equal to that of the water within the gate housing.

The general arrangement and description for the remaining elements of the gate is exactly the same as has already .been describedin the earlier sections of this description.

Whilein the foregoing we have disclosed specificembodiments of our invention, it is, nevertheless, to be understood that in practicing-the same we may resort to any and all modifications fallingwithin the scope of the appended claims defining the invention. r

We claim 1. In a gatevalve, a gate housing with a fluid passageway. therethrough, a-gate member within the housing movable transversely of the passageway and of sufli'cient dimension with respect thereto such that thereis always on one sideor the other in theopen Qrclosed. position thereof a supporting and guiding length of gate member at least equal to the dimension of the gate opening, gate member operating means including at 'least one threaded non-rising stem engaging a plane means due to pressureon the gate member.

2. In a gate valve, a gate housing with a fluid passageway therethrough, a gate member within the housing movable transversely of the passageway, gate member operating means including at least one threaded non-rising stem engaging a cooperating element on the gate member, in-

clined plane means moving the gate member axially of the passage for seating and unseating the gate member, and means counteracting any tendency of the gate to move upwardly on the inclined plane means due to pressure on the gate member.

3. In a gate valve, a gate housingwith a fluid passageway therethrough, a gate member within the housing movable transversely of the passageway, gate member operating means including a threaded non-rising element engaging 'a cooperating element on the gate member, inclined plane means moving the gate member axially of the passage for seating and unseating the gate member, and means including a toggle for counteracting any tendency of the gate to move upwardly on the inclined plane means due to pressure on the gate member.

4. In a gate valve, a gate housing with a fluid passageway therethrough, a gate member and a carriage therefor within the housing movable transversely of the passageway, gate member operating means including a threaded non-rising element engaging the carriage, inclined plane means between the carriage and the gate member for controlling movement of the gate member axially of the passage for seating and unseating, toggle means connecting said carriage and said passageway for opening and closing the same, operating means for said gate member including a threaded element and a plurality. of telescoping tubular elements enclosing said threaded element and providing a lubricantretaining chamber surrounding said threaded element,.said tubular elements being connected respectively to said housing and said gate member, andmeans preventing leakage of line fluid into said chamber including means controlled by fluid flowing through the'passageway' for maintaining a pressureon the lubricant in said chamber at least equal to the line pressure.

, V PHILLIP A. KINZIE. BERNARD A. HALLIDAY. WARREN Hr KOHLER. 

